5.5 GROUPED ELEMENTS
Figure 5–77: POWER SWING DETECT QUADRILATERAL OPERATING CHARACTERISTICS
The FlexLogic™ output operands for the power swing detect element are described below:
POWER SWING OUTER
POWER SWING TMR4 PKP
testing and special applications.
POWER SWING BLOCK
POWER SWING UN/BLOCK
to be blocked under power swings, but subsequently unblocked should a fault occur after the power swing blocking
condition has been established.
POWER SWING 50DD
ment has picked up. This operand will trigger on faults occurring during power swing conditions. This includes both
three-phase and single-pole-open conditions.
POWER SWING INCOMING
locus enters the inner characteristic).
POWER SWING OUTGOING
locus leaving the outer characteristic). This operand can be used to count unstable swings and take certain action only
after pre-defined number of unstable power swings.
POWER SWING TRIP
The settings for the power swing detect element are described below:
POWER SWING FUNCTION: This setting enables and disables the entire power swing detection element. The setting
applies to both power swing blocking and out-of-step tripping functions.
POWER SWING SOURCE: The source setting identifies the signal source for both blocking and tripping functions.
POWER SWING SHAPE: This setting selects the shapes (either "Mho" or "Quad") of the outer, middle and, inner char-
acteristics of the power swing detect element. The operating principle is not affected. The "Mho" characteristics use the
left and right blinders.
POWER SWING MIDDLE
POWER SWING INNER
FlexLogic™ operands are auxiliary operands that could be used to facilitate
FlexLogic™ operand shall be used to block selected protection elements such as distance
FlexLogic™ operand shall be used to block those protection elements that are intended
FlexLogic™ operand indicates that an adaptive disturbance detector integrated with the ele-
FlexLogic™ operand indicates an unstable power swing with an incoming locus (the
FlexLogic™ operand indicates an unstable power swing with an outgoing locus (the
FlexLogic™ operand is a trip command.
L60 Line Phase Comparison System
POWER SWING TMR2 PKP